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Finding the Third Proportional to 640.25 and 993.75

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Solution

The third proportional to 640.25 and 993.75 is: 1,542.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.25 : 993.75 = 993.75 : x
  2. Step 2: Convert to fraction form
    640.25/993.75 = 993.75/x
  3. Step 3: Cross multiply
    640.25x = 993.75 × 993.75
  4. Step 4: Simplify right side
    640.25x = 987,539.06
  5. Step 5: Solve for x
    x = 987,539.06/640.25
  6. Step 6: Final answer
    x = 1,542.43

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.